单词：sap wood
sap wood的用法和样例：
例句
- Sapwood is the lighter colored wood growing from inside the bark to the heartwood.边材色泽较浅，是从树皮到新材之间的木质部分。
- Heartwood is the mature wood, which is often darker, extending from the sapwood to the pith.心材通常是成熟的木材部分，通常色泽较暗，范围从边材一直到髓心。
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